SEROLOGICAL STUDY FOR JAPANESE ENCHEPHALITIES VIRUS AMONG HOSPITALISED PATIENTS
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1 Research Article Dr. B. V. Ramana,, 2012; Volume 1(5): ISSN: SEROLOGICAL STUDY FOR JAPANESE ENCHEPHALITIES VIRUS AMONG HOSPITALISED PATIENTS Dr. B. V. RAMANA 1, P.PAVANI 1, Dr. ABHIJIT CHAUDHURY 1 1. Department of Microbiology, Sri Venkateswara Institute of Medical Sciences, Tirupati, Andhra Pradesh, India. Accepted Date: 03/10/2012 Publish Date: 27/10/2012 Keywords Japanese encephalitis Undifferentiated fever Encephalitis Corresponding Author Dr. B. V. RAMANA Assistant Professor, Department of Microbiology, Sri Venkateswara Institute of Medical Sciences, Tirupati , Andhra Pradesh, India. Abstract Abstract Japanese encephalitis (JE)-epidemics have been reported in many Bacterial infections are one of the most common causes parts of the country. The incidence has been reported to be high for exudative pleural effusion. Pleural effusions among associated pediatric with group pneumonias with high cause mortality. re The morbidity incidence and of JE in recent mortality times is than showing pleural an increasing effusion trend. alone. It appears Retrospective that JE may analysis of 472 pleural fluid samples received during the become one of the major public healthh problems in India, period of January 2010 to December 2011 was done. considering Organisms the quantum and their of the antibiogram vulnerablee patterns pediatric population, were the determined. proportion of Among JEV infections 472 samples among the 31 12(66.1%) encephalitic were children culture positive. Organisms isolated were Klebsiella and wide scattering of JE-prone areas. JE burden can be estimated pneumoniae (30%), Pseudomonas aeruginosa (23%), satisfactorily NFGNB to (17%), some extend E. coli by (15%), strengtheni Citrobacter ing diagnostic (10%), facilities for JE Staphylococcus confirmation in aureus hospitals (5%). and K. by pne maintenance eumoniae were of contact sensitive to piperacillin tazobactum (92%) and imipenem with the nearby referral hospitals to collect the particulars on JE (80%), resistant to cefotaxime (90%). Pseudomonas was cases. sensitive Vaccination to proves piperacillin to be the tazobactum best to protect (73.8%) the individual and against amikacin disease (72%). Bacteriology of pleural infection is changing, Gram negative bacteria from the pleural infections appear to be increasing. The majority of the pleural fluid isolates were hospital pathogens showing high level of resistance to most of the antibiotics. Piperacillin Tazobactum and imipenem were most effective for gram negative isolates.
2 Dr. B. V. Ramana,, 2012; Volume 1(5): INTRODUCTION Japanese encephalitis (JE) is a dreadful disease which is caused by single stranded positive sense RNA virus belonging to family flaviviridae. JE virus generates high mortality in pediatric group and today it is a major public health problem in South East Asia. Due to demographic, and environmental reasons vector transmission of JEV infection is very high and its outbreak commonly occurs every year among children in JE endemic and in JE-prone areas. 1 In India, the actual JE burden cannot be easily estimated because of scattered occurrence of JE in different states and regions. It could be only possible by strengthening diagnostic facilities for JE confirmation in hospitals situated in rural areas and by establishing national surveillance system for JE. In India every year 30,000 to 50,000 cases of JE are reported out of which 10,000 patients died due to unavailability of treatment. Starting from April to November millions of JE cases are reported as vulnerable pediatric threat in many countries like China, India, Nepal, Bangladesh, Bhutan, Tibet, Korea, Japan, Thailand, Malaysia, Vietnam, Philippines. 2 Unfortunately, most of the Southeast Asian countries do not have appropriate immunodiagnostic tools for timely detection of JE. Besides this, due to economic reasons they cannot afford an efficient JE vaccine for immunization due to large number of JE patients. Due to lack of detection and extra delay in treatment very high mortality occurs almost every year in these countries. 3 Clinical presentation and patient history is suggestive of diagnosis but it still remains unreliable method of determining the specific etiology. A definite diagnosis improves the accuracy in treatment, as well as in better management of the patient. This prospective study was conducted to know the prevalence of Japanese encephalitis virus infection among hospitalized patients. MATERIALS & METHODS This prospective study was conducted at Department of Microbiology, in a tertiary care hospital over a period 5 months from January 2012 to May During this period consecutive non repetitive 50 blood samples from patients with undifferentiated fever with encephalitis
3 Dr. B. V. Ramana,, 2012; Volume 1(5): received from various clinical departments are tested for the presence of Japanese encephalitis virus IgM antibodies by rapid test method. It was done by using SD BIO line (JEV IgM) of one step IgM antibodies to Japanese encephalitis virus rapid test KIT. The diagnostic criteria for Japanese Encephalitis which were adopted in this study was the demonstration of the IgM antibodies by MAC ELISA in CSF samples, as reported by others, 4 which is the Gold standard for the diagnosis of Japanese Encephalitis. To ensure the specificity of the assay, known positive and negative controls were included. There was no geographical or temporal clustering of cases. In this prospective study blood samples from patients with undifferentiated fever with encephalitis from various departments are tested for detection of JEV IgM antibodies by rapid test method. Among 50 samples tested, 26 are from males and 24 from females. Among these 50 samples tested all are negative for JEV IgM antibodies. RESULTS AND DISCUSSION DISCUSSION Japanese Encephalitis is one of the leading causes of Acute Encephalopathy, affecting children and adolescents in Tropical and Sub tropical Asia. Epidemic outbreaks of Japanese Encephalitis continue to pose a significant public health problem in most parts of India, especially in the Southern states. The present study was carried out to diagnose Japanese Encephalitis cases among patients who were clinically suspected as Encephalitis. Among the clinical manifestations, reported fever was present in 100 % of the cases and altered sensorium and headache accounted for 85 % % and 50 % of the cases respectively, Male preponderance, which were noticed in our study is also well documented by several earlier reports. 5 The available information on the proportion of JEV infections among undifferentiated fever cases varies greatly in different populations. In a study in Thailand, 14% (22/156) of adult patients presenting with acute undifferentiated fever were due to JEV. In a study carried out
4 Dr. B. V. Ramana,, 2012; Volume 1(5): in Penang, Malaysia, among pediatric patients with non-specific febrile illness, 0.4% (2/482) were due to JEV infection during 1990 to In another study conducted in 1967 in South Vietnam among American servicemen presenting with acute pyrexia of unknown origin, 6.8% (54/793) of cases were attributed to JEV. 7 The viral encephalitis cases that were negative for JEV infection in the present study may have been due to other common etiological agents such as mumps, measles, enteroviruses such as coxsackie and echo, herpes simplex, and adenoviruses. Bacterial and tuberculous meningitis also fall into the differential diagnoses when biochemical findings and the cellular changes in the CSF are not conclusive. Cerebral malaria and Reye s syndrome also present with a similar clinical picture. One of the reasons for the no JEV infections among undifferentiated fever cases in the present study may be due to the fact that almost all of the patients had probably been previously exposed to the JEV and were therefore protected from disease. In previous studies, nearly all Thai adults in Chiangmai, Thailand, 8 were shown to be infected by the age of 30 years and it has been suggested that previous infection with JEV protects against disease to a greater extent than it protects against re-infection. Cases of undifferentiated fever negative for JEV infection may have been due to infections such as influenza, infectious mononucleosis, chikungunya, leptospirosis, typhoid, or rickettsial diseases. Japanese Encephalitis was sporadic in nature affecting all age groups, but predominantly, children. No specific antiviral therapy is available for Japanese encephalitis. The specific etiological diagnosis of Japanese Encephalitis cases helps the patient management protocols and avoids unnecessary use of antiviral therapy. Acyclovir therapy which is of no proven advantage in the cases of Encephalitis which were caused due to the Japanese Encephalitis Virus, needs supportive and symptomatic treatment. Thus, the management protocol was restricted to temperature control, seizure control, and the control of aggravating intracranial pressure and fluid and electrolyte CONCLUSION management. Current JE
5 Dr. B. V. Ramana,, 2012; Volume 1(5): vaccines are safe, effective and costeffective. Effective JE vaccination programs provide the only solution to the ongoing threat of JE to endemic populations. REFERENCES 5. Chatterjee S, Chattopadhyay D, Bhattacharya MK and Mukherjee B: Serosurveillance for Japanese encephalitis in children in several districts of West Bengal, India. Acta Pediatric. 2004; 93(3): Cardosa MJ, Choo BH and Zuraini I: A 1. Kabilan L, Rajendran R, Arunachalam N, Ramesh S, Srinivasan S, Samuel PP and Dash AP: Japanese encephalitis in India, an overview, Indian J. Pediatric. 2004; 171(7): Chew-Lim M and Ng CY: Recurrent viruses in a Singapore intensive pig farming estate. Ann. Acad. Med. Singapore, 1987; 16(4): Gunakasem P, Chantrasri C, Simasathien P, Chaiyanun S, Jatanasen S and Pariyanonth A. Surveillance of Japanese encephalitis cases in Thailand, Southeast Asian J. Trop. Med. Public Health, 1981, 12(3), Badrinath S and Srinivasan S: Japanese encephalitis in around Pondicherry, South India: A clinical appraisal and Prognostic indicators for the outcome. J. Trop. Pediatrics. 2003; 49 (1): serological study of Japanese encephalitis virus infections in northern Peninsular Malaysia. Southeast Asian J. Trop. Med. Public Health, 1991; 22(3): Berman SJ, Irving GS, Kundin WD, Gunning JJ and Watten RH: Epidemiology of the acute fevers of unknown origin in South Vietnam: effect of laboratory support upon clinical diagnosis. Am J Trop Med Hyg 1973; 22(6): Fukunaga T, Igarashi A, Okuno Y, Ishimine T, Tadano M, Okamoto Y and Fukai K: A seroepidemiological study of Japanese encephalitis and dengue virus infections in the Chiang Mai area, Thailand, Biken. J., 1984: 27(1); 9-17.
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